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/*------------------------------------------------------------------------------
* Copyright (C) 2003-2006 Ben van Klinken and the CLucene Team
*
* Distributable under the terms of either the Apache License (Version 2.0) or
* the GNU Lesser General Public License, as specified in the COPYING file.
------------------------------------------------------------------------------*/
#include "CLucene/StdHeader.h"
#include "WildcardTermEnum.h"
CL_NS_USE(index)
CL_NS_DEF(search)
bool WildcardTermEnum::termCompare(Term* term) {
if ( term!=NULL && __term->field() == term->field() ) {
const TCHAR* searchText = term->text();
const TCHAR* patternText = __term->text();
if ( _tcsncmp( searchText, pre, preLen ) == 0 ){
return wildcardEquals(patternText+preLen, __term->textLength()-preLen, 0, searchText, term->textLength(), preLen);
}
}
_endEnum = true;
return false;
}
/** Creates new WildcardTermEnum */
WildcardTermEnum::WildcardTermEnum(IndexReader* reader, Term* term):
FilteredTermEnum(),
__term(_CL_POINTER(term)),
fieldMatch(false),
_endEnum(false)
{
pre = stringDuplicate(term->text());
const TCHAR* sidx = _tcschr( pre, LUCENE_WILDCARDTERMENUM_WILDCARD_STRING );
const TCHAR* cidx = _tcschr( pre, LUCENE_WILDCARDTERMENUM_WILDCARD_CHAR );
const TCHAR* tidx = sidx;
if (tidx == NULL)
tidx = cidx;
else if ( cidx && cidx > pre)
tidx = min(sidx, cidx);
CND_PRECONDITION(tidx != NULL, "tidx==NULL");
int32_t idx = (int32_t)(tidx - pre);
preLen = idx;
CND_PRECONDITION(preLen<term->textLength(), "preLen >= term->textLength()");
pre[preLen]=0; //trim end
Term* t = _CLNEW Term(__term, pre);
setEnum( reader->terms(t) );
_CLDECDELETE(t);
}
void WildcardTermEnum::close()
{
if ( __term != NULL ){
FilteredTermEnum::close();
_CLDECDELETE(__term);
__term = NULL;
_CLDELETE_CARRAY( pre );
}
}
WildcardTermEnum::~WildcardTermEnum() {
close();
}
qreal WildcardTermEnum::difference() {
return 1.0f;
}
bool WildcardTermEnum::endEnum() {
return _endEnum;
}
bool WildcardTermEnum::wildcardEquals(const TCHAR* pattern, int32_t patternLen, int32_t patternIdx, const TCHAR* str, int32_t strLen, int32_t stringIdx)
{
for (int32_t p = patternIdx; ; ++p)
{
for (int32_t s = stringIdx; ; ++p, ++s)
{
// End of str yet?
bool sEnd = (s >= strLen);
// End of pattern yet?
bool pEnd = (p >= patternLen);
// If we're looking at the end of the str...
if (sEnd)
{
// Assume the only thing left on the pattern is/are wildcards
bool justWildcardsLeft = true;
// Current wildcard position
int32_t wildcardSearchPos = p;
// While we haven't found the end of the pattern,
// and haven't encountered any non-wildcard characters
while (wildcardSearchPos < patternLen && justWildcardsLeft)
{
// Check the character at the current position
TCHAR wildchar = pattern[wildcardSearchPos];
// If it's not a wildcard character, then there is more
// pattern information after this/these wildcards.
if (wildchar != LUCENE_WILDCARDTERMENUM_WILDCARD_CHAR &&
wildchar != LUCENE_WILDCARDTERMENUM_WILDCARD_STRING){
justWildcardsLeft = false;
}else{
// to prevent "cat" matches "ca??"
if (wildchar == LUCENE_WILDCARDTERMENUM_WILDCARD_CHAR)
return false;
wildcardSearchPos++; // Look at the next character
}
}
// This was a prefix wildcard search, and we've matched, so
// return true.
if (justWildcardsLeft)
return true;
}
// If we've gone past the end of the str, or the pattern,
// return false.
if (sEnd || pEnd)
break;
// Match a single character, so continue.
if (pattern[p] == LUCENE_WILDCARDTERMENUM_WILDCARD_CHAR)
continue;
if (pattern[p] == LUCENE_WILDCARDTERMENUM_WILDCARD_STRING)
{
// Look at the character beyond the '*'.
++p;
// Examine the str, starting at the last character.
for (int32_t i = strLen; i >= s; --i)
{
if (wildcardEquals(pattern, patternLen, p, str, strLen, i))
return true;
}
break;
}
if (pattern[p] != str[s])
break;
}
return false;
}
}
CL_NS_END
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